/Engine/Source/Editor/MaterialEditor/Public/MaterialPropertyHelpers.h
Returns group for parameter. Creates one if needed.
static [FEditorParameterGroup](API\Editor\UnrealEd\MaterialEditor\FEditorParameterGroup) & GetParameterGroup ( class [UMaterial](API\Runtime\Engine\Materials\UMaterial) * InMaterial, [FName](API\Runtime\Core\UObject\FName) & ParameterGroup, [TArray](API\Runtime\Core\Containers\TArray)< [FEditorParameterGroup](API\Editor\UnrealEd\MaterialEditor\FEditorParameterGroup) > & ParameterGroups )